--- a/mercurial/revlogutils/nodemap.py	Wed Jan 15 15:47:31 2020 +0100
+++ b/mercurial/revlogutils/nodemap.py	Wed Jan 15 15:47:40 2020 +0100
@@ -34,6 +34,8 @@
 
     (only actually persist the nodemap if this is relevant for this revlog)
     """
+    if revlog._inline:
+        return  # inlined revlog are too small for this to be relevant
     if revlog.nodemap_file is None:
         return  # we do not use persistent_nodemap on this revlog
     callback_id = b"revlog-persistent-nodemap-%s" % revlog.nodemap_file